Add e2e test for help command

e2e/command_help.test.ts

@@ -0,0 +1,49 @@
+import * as path from 'path';
+import * as assert from 'assert';
+
+import TestServer from './lib/TestServer';
+import eventually from './eventually';
+import { Builder, Lanthan } from 'lanthan';
+import { WebDriver } from 'selenium-webdriver';
+import Page from './lib/Page';
+
+describe("help command test", () => {
+  let server = new TestServer();
+  let lanthan: Lanthan;
+  let webdriver: WebDriver;
+  let browser: any;
+  let page: Page;
+
+  before(async() => {
+    lanthan = await Builder
+      .forBrowser('firefox')
+      .spyAddon(path.join(__dirname, '..'))
+      .build();
+    webdriver = lanthan.getWebDriver();
+    browser = lanthan.getWebExtBrowser();
+
+    await server.start();
+  });
+
+  after(async() => {
+    await server.stop();
+    if (lanthan) {
+      await lanthan.quit();
+    }
+  });
+
+  beforeEach(async() => {
+    page = await Page.navigateTo(webdriver, server.url());
+  })
+
+  it('should open help page by help command ', async() => {
+    let console = await page.showConsole();
+    await console.execCommand('help');
+
+    await eventually(async() => {
+      let tabs = await browser.tabs.query({ active: true });
+      assert.strictEqual(tabs[0].url, 'https://ueokande.github.io/vim-vixen/')
+    });
+  });
+});
+